I suspect that many folks are like me....that is to say we use GPS/moving map/DME the first time or two on a route and then look out the window and use headings on subsequent trips. I don't like having my head down when flying around DEN or around the mountains. I expect many folks like to have their eyes outside when flying little planes.
That's the real beauty of the systems. You get a buttload of information in just a glance so you can devote a lot more attention out the window. Yeah, it was just the heading you looked for, but at the same time, all this other information was in your field of view that you absorbed and processed without hardly a thought. You see the plane is near the magenta line, you don't need give it any more thought than that, you have confirmed your pilotage out the window in half a second.